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AC voltage rectifier comprises an ohmic area, to which AC voltage is supplied, via an insulating area connected to provide proper thermal contact to a thermoelectric structure, from which DC voltage is taken. At the same time at a certain distance from the ohmic area surface there is a solar concentrator fixed on a holder, which additionally heats the ohmic area, besides, the distance between the ohmic area and the solar concentrator corresponds to the focus distance of lenses, included into the composition of the solar concentrator, and the surface of the thermoelectric structure opposite to the one in contact with the ohmic area is blown with a ventilating unit. |
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AC voltage rectifier comprises an ohmic area, to which AC voltage is supplied, via an insulating area connected to provide proper thermal contact to a thermoelectric structure, from which DC voltage is taken. At the same time a heat source made in the form of a through reservoir with geothermal water is coupled to the surface of the ohmic area that is opposite to the one in contact with the thermoelectric structure, and the surface of the thermoelectric structure opposite to the one in contact with the ohmic area is coupled with a ventilating unit. |
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Magnetic integral symmetrical converter Invention relates to electrical engineering. Magnetic integral symmetrical converter with an integral function of a transformer and an inductor includes the following: an integral magnetic element having a magnetic core with three magnetic columns, which includes at least three windings (Np, NS1, NS2) and at least one air gap for energy accumulation, where primary winding (Np) and the first secondary winding (NS1) are wound about the first magnetic column or both of them are wound about the second magnetic column and the third magnetic column, and the second secondary winding (NS2) is wound about the second magnetic column, and a hollow output current flows along the second secondary winding (NS2); a symmetrically operating inverter circuit with two outputs, which acts on primary winding (Np); and a group of synchronous rectifiers (SR1, SR2), the control signals of electrodes of the lock of which and the control signals of electrodes of the lock of a group of diodes of a power supply switch (S1, S2) of the symmetrically operating inverter circuit with two outputs complement each other. |
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Invention relates to converter equipment. In order to obtain submodule (13) for charging or discharging of energy accumulator (22) with capacitor unit (14) and circuit (15) of power semiconductor instruments, which includes connected and disconnected power semiconductor instruments (16, 17), with that, capacitor unit (14) and circuit (15) of power semiconductor instruments are connected to each other so that depending on control of power semiconductor instruments (16, 17) on output terminals (19, 20) of submodule (1) there shaped is voltage decreasing on the capacitor, or zero voltage, with that, submodule (13) provides for individual coordination of a charging process with requirements of the corresponding energy accumulator, and besides, it is cheap, it is proposed to connect energy accumulator (22) to submodule (13) through stabiliser (21) of constant voltage so that stabiliser (21) of constant voltage is connected to capacitor unit (14) and equipped for conversion of capacitor voltage (Uc) decreasing on capacitor unit (14) to charging voltage required for charging of energy accumulator (22), as well as for conversion of discharging voltage (EL) decreasing at discharge on energy accumulator (22) to voltage (Uc) of the capacitor. |
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Device for connection to resistor having mainly inductive nature This invention relates to a device for connection to resistor (2) having mainly inductive nature. Device includes reactive element (3A, 3B, 3C). Besides, the device is provided with outputs (U1, U2, W1, W2, V1, V2) for introduction of output signals of electrical inverters for parallel supply, and at least one output for connection to a supply terminal for a resistance phase so that the device is created mainly for filtration of a high-frequency differential component of at least two output signals during usage. |
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Stable current source includes in-series connected filter, transformer with an interrupting transformer connected to primary winding and a rectifying diode in secondary winding, after which a low-pass filter with a measuring shunt in an output current circuit is installed, the measurement outputs of which are connected to a voltage-to-frequency converter, the output frequency of which is supplied through a galvanic isolation element to the input of a frequency-pulse modulator controlling the switch frequency of the interrupting transistor. |
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Direct to alternate current converter Direct to alternate current converter includes direct voltage source with capacitor at the output, bridge voltage inverter consisting of four switch elements composed of a transistor and reverse diode each, with direct current outputs connected to direct voltage source outputs and alternate voltage outputs connected to primary winding of transformer, secondary winding of which is connected to a load, and control system. Hall sensor is built in magnetic conductor of the transformer, sensor output connected to control system input with its outputs connected to inputs of first and second drivers, each driver controlling two serial switch elements of bridge voltage inverter. |
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Method of direct to alternate voltage converter and device for method implementation Method of converter operation and device for method implementation involve direct to alternate voltage converter functioning as SEPIC converter: when positive half-wave of output alternate voltage is formed, energy accumulated in reactor is supplied to primary transformer winding, and during generation of negative half-wave of output alternate voltage energy accumulated in first capacitor is supplied to primary transformer winding. Direct to alternate voltage converter includes first and second semiconductor switches of direct to alternate voltage converter, acting as a synchronous rectifier; input direct voltage circuits of the converter have galvanic isolation from output alternate voltage circuits of the converter. |
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Voltage converter of power source includes multilevel power source voltage converter with possible output of multiple levels of the first voltage at one out of two output terminals via multiple conductive tracks; first power accumulator and first switching element with possible direct connection to the first output terminal and connection or disconnection of the first power accumulator to or from the first conductive track so as to combine voltage level of the first power accumulator with the first voltage level as a second voltage fed to second output terminal. With this topology, voltage rating of each poser semiconductor devices can be maintained at lower method without changes in the number of power semiconductor devices. In addition, VDRM is lower compared to standard topology. It allows for cost reduction and reliability improvement. |
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Isolation in electric power transmission system Invention refers mainly to power transmission lines, particularly to substation of power transmission system. Substation features converter including first set of serial converter gate elements between first and second potentials, so that absolute value of the second potential is higher than absolute value of the first potential, and second set of converter gate elements, including at least one converter gate element between second and third potential. Absolute value of the third potential is higher than absolute value of the second potential, and all converter gate elements of the second set are positioned inside one or more cases located on long pole-type isolation. Potential of pole-type isolation end where the cases are located lies between the second and third potentials, and the other end of the pole-type isolation has "earth" potential. |
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Multizone direct to alternate current converter Invention can be applied in controlled AC drives and as a controlled second converter in frequency converters with intermediate DC stage. Device includes current source, 3-phase bridge circuit where each bridge arm consists of 2 groups of n serial controlled unidirectional rectifier cells, to connection points of which at each bridge arm two extra groups of uncontrolled rectifier cells are added so that one group of n controlled rectifier cells is connected by cathode of the outmost cell to a load and by anode of the other outmost cell to positive pole of current source, second group of controlled rectifier cells is connected by anode of outmost cell to a load and with cathode to negative pole of current source, diodes of the first extra group, with its cathodes towards the load, are inserted between anode of serial controlled rectifier cells and load, and similarly, diodes of the second extra group, with its anodes towards the load, are inserted between cathodes of controlled rectifier cells of the second group and load. |
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Invention refers to electric engineering and can be used for control of resonance power converter. Method of switch device (260) control involves resonance circuit (350) supplied with switching voltage (Uwr) for resonance current (Ires), generation to ensure required output power (rP) at the output of resonance power converter (100). Device is adapted to the method of switching device control. In addition, resonance power converter includes control device for implementation of the control method. |
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Twenty four-phase converter of three-phase-voltage-to-constant voltage Proposed converter serves to supply DC consumers that demand high quality conversion at various levels of the rectified voltage. The suggested converter comprises four symmetrical three-phase power sources and five in-sequence gate groups, the outermost groups consist of three gates coupled into anode and cathode gate deltas, which common points form output leads of the device while the remaining three groups are made as six-gate rings with three pairs of diametrical connection points of the same gate electrodes. Adjacent gate rings are connected at three points each formed by a free pair of the point of connection between the electrodes in the adjacent ring gates. The converter is equipped with twenty one additional gates, gates of the six-gate rings are made as controlled ones, and three additional gates are also made as controlled ones, while the remaining ones are uncontrolled. |
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Three-phase inverter of variable structure Device contains a direct-current source, stand-alone single-phase inverters, a transformer with a rotating magnetic field containing the primary and secondary windings, contact blocks and a direct-current source, which includes two accumulators and five power-circuit switches, each of four contact blocks comprises three power-circuit switches, two inputs and three outputs, at that the secondary windings are placed at the stator at an angle of 120°, and their beginnings serve as the three-phase outputs of the device while their ends are joined and form the delta-connected three-phase winding. |
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Invention is related to the field of engineering and may be used in uninterrupted power supply (UPS) systems and inverters. The method and device solving the problem of mismatch between UPS systems of non-sinusoidal oscillations and loads with active power factor compensation (PDC) includes the following stages when non-sinusoidal oscillations to be delivered as a load (e.g., voltage fluctuations) are generated with relative pulse duration of pulse-width modulation (PWM); discretisation of these non-sinusoidal oscillations to accumulate output signal readings and regulation of relative pulse duration to control non-sinusoidal oscillations depending on output signal readings in order to deliver the desired signal characteristic (e.g., mean-square signal level) as a load. In the embodiments the relative output pulse duration is regulated in different ways in case of growing and lowering power consumption by the load respectively. |
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Power supply source for electric installations Device comprises three-phase rectifier with a filter loaded to voltage inverter with load, for example, with parallel LC-circuit, the inverter control unit coupled to the reference voltage setting unit and a voltage sensor, a current sensor, a temperature sensor and a pulse-width modulator; there is an additional matching transformer, an additional source of constant voltage and a bridge saturable core reactor, at that secondary winding of the matching transformer is connected to the load while primary winding is coupled to the above inverter through the in-series first diagonal of bridge saturable core reactor and current sensor, the second diagonal of the saturable core reactor is shunted by the linear choke and diode and connected through a key to the source of constant voltage, at that the key is installed in parallel to diode and is coupled through the input to the control circuit based on pulse-width modulator. |
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Invention is related to a capacitive power supply unit, moreover to an electronic device equipped with the capacitive power supply unit. To this end at the first facility the capacitive power supply unit contains an input part (10) having input contacts (Ln, Nt) to connect an alternating-current source and a capacitive coupling; a rectifying part (20) connected through the capacitive coupling to the input contacts (Ln, Nt) and an output part (30) connected to the rectifying part, there's an auxiliary device (R1) limiting start-up current where output contacts (V+, V-) are connected to the respective contacts of a device (D5) limiting output voltage, and in-series capacitive impedance (Zdc) conducting direct current has a resistive component with a resistive value equal to at least 0.2 of the first circuit resistive value. At the second facility the electronic device contains a power input (101), (102) for connection to the supply mains; a capacitive power supply unit (110) coupled to the power input; the first functional unit (140) receiving power supply from the capacitive power supply unit. |
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Control device for flyback converter Device contains a transformer for the insulated voltage flyback converter, a diode, a secondary circuit with load and a switching element, at that one output of the switching element is connected to anode of the first diode while its cathode is connected to the summator input and to one input of the primary transformer winding, by the other input this winding is connected to the power supply bus; the second output of the switching element is coupled to the common bus at the side of the transformer primary winding; the third output of the switching element is coupled to the control device output; secondary winding though the secondary circuit is connected to the load; the summator is connected to the power supply bus by its one input and to the output of the controlled signal source by its other input, while its output is connected to the input of a measuring instrument; the measuring instrument has two input coupled to the tripping pulse generator; he tripping pulse generator is connected to the control device input. |
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Invention is related to the field of electric engineering and power electronics and can be used for design of alternating-current generation systems or AC uninterrupted power supply systems with a voltage inverter. In the suggested method for control of a static converter in an alternating-current generation system in short-circuit conditions load current is measured and when it reaches the preset value a control signal for the voltage converter is changed providing the maximum value of short-circuit current thus regulating the direct-current value at the inverter input, stabilising short-circuit current in the load during a certain period of time. |
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Method to arrange grouped operation of reversible converters Clock frequency synchronisation of a slave converter is made with the master one, balance of output currents for the converters at the permitted unbalance is attained by recording of the load characteristic for each separate device where by means of a control system an initial value of load current is set, load resistance is changed at the recorded current setting, values of voltage and current are measured at the selected point and compared, the phase shift and pulse duty cycle are also measured at the output of these devices at a stage of their designing. After that they are compared and tuned in order to ensure identical load characteristics, phase and pulse duty cycle of the output current values with error not exceeding 2-5%. |
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Power conversion device consists of the following components: switching elements (S1-S6) which are connected in parallel to the common current-conducting bus and excite currents with different phases; and a controller (14) of the electric motor which controls the respective switching elements (S1-S6). The controller (14) of the electric motor controls the respective switching elements (S1-S6) so that the direction of current fluctuation stipulated by switching on/off of one switching element is opposite to the direction of current fluctuation stipulated by switching on/off of at least one of other switching elements. |
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Application: in the field of electrical engineering. Inverter generator contains the first, second and third inverters, the first, second and third controllers to control ON/OFF switching of the inverter switching elements as well as control of the first inverter as the master and the second and third inverter as slaves, a three-phase output, a single-phase output and a motor control module to send an output signal of the selector switch to the first controller, etc. Thus three-phase or single-phase alternating current is supplied by means of such control of ON/OFF switching of the inverter switching elements so that at the output of the first, second and third inverters at the selector switch signal the three-phase or single-phase alternating current is present, at that the output signal of the first inverter becomes a reference one. |
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Synchronising device for power supply systems with neutral wire Claimed device includes auxiliary busbars A2, B2, C2, six summators and two adaptive non-periodic first order filters that ensure filtration for the three-phase voltage system at minimum required quantity of non-periodic filtering stages based on the generalised vector image of the three-phase sequence. |
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Measuring transformer and method of controlling measuring transformer Invention relates to electrical engineering. The converter comprises control units (3), which are respectively connected to one of multiple sources (2) of input voltage. Each control unit (3) varies input voltage (UIN1, UIN2, UIN3, UIN4) supplied from the connected input voltage source (2) and applies an intermediate voltage (U1, U2, U3, U4). The converter comprises switching elements (41), wherein potentials (V0, V1, V2, V3, V4) of intermediate voltages, determined by the intermediate voltages (U1, U2, U3, U4), are applied across each switching element (41) and each switching element (41) selects one of the potentials (V0, V1, V2, V3, V4) of intermediate voltage to output as the corresponding potential (VOUT1, VOUT2, VOUT3) of output voltage. The method of using such a converter comprises the following steps: setting up the control units (3) such that the control units (3) apply potentials of intermediate voltages comprising the applied potentials (VOUT1, VOUT2, VOUT3) of output voltages; setting up the switching elements (41) such that one of the potentials (V0, V1, V2, V3, V4) of intermediate voltage is selected and applied across the corresponding output (A1, A2, A3). |
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Digital converter and energy conversion device Group of inventions is related to analogue-to-digital converters and can be used in energy conversion devices for power electronics. The device contains a number of data signals storage units which can select data signals with delay equal to the preset time interval, moreover these signals specify instant value change, and store these selected values with simultaneous selection of each of these signals; a deleting unit capable to delete the maximum and minimum value from values stored at the number of data signals storage units; an averaging unit capable to take an average of values which are not deleted by the deleting unit; and a converter capable of analogue-to-digital conversion of the value outputted from the averaging unit and displaying this converted value as digital information. |
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Static reversible converter for power supply of alternating and direct-current consumers Invention is related to reversible converters designed for power supply of alternating and direct-current consumers and the system contains the first input/output port at the side of connected accumulator battery and the second input/output port at the side of alternating-current supply mains. In inverter mode direct current is supplied from the accumulator battery to the first port while alternating current is outputted from the second port. In rectifier mode input alternating current is supplied to the second port while direct current is outputted from the first port. Between the ports there are in-series interconnected high-frequency link and a link of industrial frequency self-commutated inverter. Operation of the links is controlled by the control system. The high-frequency link is made as a combined scheme of resonance inverters and voltage inverters connected in parallel by their inputs and in-series by their outputs; while in rectifier mode is works as a combined scheme of voltage inverters and rectifiers. In inverter mode all invertors but one are non-regulated. One inverter is a regulated one. Non-regulated inverters create reference output voltage (minimum required). The regulated inverter shapes additional voltage added to the reference one so that output voltage could have the required value. In the rectifier mode wiring scheme of the reversible converter operates to generate charge current for accumulator batteries. |
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Transformerless voltage converter Voltage converter consists of two identical sections of an excessive voltage blanking unit which are made as an in-series connected capacitor and resistor switched on into two wires respectively between the outputs for connection of the power supply source and the inputs of the first and second bridge rectifiers; the output of the first rectifier is connected in parallel to the input of a voltage stabiliser and in both wires at output of the second rectifier the first and second regulating elements are introduced which are connected in-series to the input of the voltage stabiliser. |
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Adaptive integrating synchronisation device Invention relates to the field of electric engineering and may be used in control systems for direct- and alternating-current thyristor converters. Adaptive integrating synchronisation device represents a closed integrating self-oscillating system with the scheme of amplitude-frequency correction. The device contains a source of signal synchronisation (not specified) - input of synchronisation device, the first summator (1), an integrator (2), the second summator (3), a relay element (4), a frequency-to-voltage converter (5), the third summator (6), an amplitude modulator (7) and a reference-voltage source (8). Improvement of the device operational accuracy is attained due to its adaption to frequency of synchronising action in result of automatic regulation of switching threshold for the relay element (4) on account of introduction of the frequency-to-voltage converter (5), the second (3) and the third (6) summators, the amplitude modulator (7) and the reference-voltage source (8). |
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In bridge voltage converter based on transistors there is additional capacitor circuit connected between the first and second outputs of transistor bridge output circuit. In the most elementary case additional capacitor circuit consists of one capacitor. In another version of the device additional capacitor circuit is made with four capacitors, and its first, second, third and fourth capacitors are connected in parallel to output circuits of the first, second, third and fourth high-power transistors respectively. |
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Stabilised quasiresonent converter Invention relates to converting equipment and it can be used for power supply systems of radar stations, radio-technical facilities, automatic and computer facilities. Stabilised quasiresonant converter contains two in-series charging MIS transistors, two series-connected recuperating diodes, two series-connected capacitors, series-connected resonant capacitor and choke, power transformer, two rectifiers, two voltage dividers, filter capacitor, load resistor, modulating MIS transistor, two single-ended PLM-controllers, two control transformers, time-setting RC-circuit, emitter follower, two differentiating RC-circuits. There is measuring winding of power transformer, the second modulating MIS transistor, two single-ended PLM-controllers, three time-setting RC-circuits, two differentiating RC-circuits, the second emitter follower, two summators, integrator, filter, clock-pulse generator, trigger, two logical AND components with respective relations. |
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Method for conversion circuit control and device for realisation of this method Invention is attributed to the field of electric engineering and can be used for conversion circuit control. According to the control method the conversion circuit contains partial conversion systems (1), (2) of inductance (L1, L2); each partial conversion system (1, 2) contains at least one two-pole commutation cell (3) and it contains two in-series controlled bidirectional power semiconductor switches with controlled one-directional passage of current and capacitive storage. Power semiconductor switches of commutation cells (3) in the first and second partial conversion system (1) are controlled by control signals (S1) and (S2) respectively. In order to calculate capacitive storage for power of the conversion circuit notwithstanding current required at output of the conversion circuit, i.e. from its frequency, control signal (S1) is shaped of voltage fluctuation signal (VL) at inductances (L1, L2) and commutation function (α1). Additional control signal (S2) is shaped of voltage fluctuation signal (VL) at inductances (L1, L2) and commutation function (α2). Commutation functions (α1, α2) are shaped by signal (VA) of voltage fluctuations (Vu) at the output (A) and selected reference signal (Vref). |
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Multilevel frequency converter with differential voltage levels and bypass semiconductor keys Invention pertains to electrical engineering and can be used in high voltage regulated electrical drives. Multilevel frequency converter with differential voltage levels and bypass semiconductor keys contains input multi-winding transformer, control system and several levels of power cells in each phase. Output voltage of cells for each level is different: output voltage of the first level cells is equal to half of the rated output voltage of frequency converter and each next level is twice less than voltage of the previous level. In parallel to output of each power cell there's bypass semiconductor key, one semiconductor key of power cell is connected to the first control output of the control system by commutator switch in case of the cell failure, while its other control input is connected to the second control output of the control system by commutator switch in operating modes to change output voltage of the frequency converter. |
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Twelve-phase step-up autotransformer phase changer Device includes a three-phase autotransformer, having three windings 1, 2, 3 of a primary coil and six windings 4, 5, 6, 7, 8, 9 of secondary coils, six interconnected windings 4, 5, 6, 7, 8, 9 of a primary coil, having taps 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21 from windings, the winding 1 of the primary coil of the first phase is connected by its end to a node B, where windings 6 and 8 of the secondary coils of the second phase and third phase are connected; the winding 2 of the primary coil of the second phase is connected by its end to a node D, where the windings 9 and 5 of secondary coils of the third phase and the first phase are connected; the winding 3 of the primary coil of the third phase is connected by its end to a node F, where windings 4 and 7 of secondary coils of the first phase and the second phase are connected; the beginning of the winding 4 of the secondary coil is connected to the beginning of the winding 8 of the secondary coil to form a node A; the end of the winding 8 of the secondary coil is connected to the end of the winding 6 of the secondary coil to form a node B; the beginning of the winding 6 of the secondary coil is connected to the beginning of the winding 5 of the secondary coil to form a node C; the end of the winding 5 of the secondary coil is connected to the end of the winding 9 of the secondary coil to form a node D; the beginning of the winding 9 of the secondary coil is connected to the beginning of the winding 7 of the secondary coil to form a node E; the end of the winding 7 of the secondary coil is connected to the end of the winding 4 of the secondary coil to form a node F and close the loop of windings of the secondary coils forming a "hexagon" A, B, C, D, E, F; each winding of the secondary coil of the autotransformer is a side of the "hexagon" A, B, C, D, E, F, which converts a symmetrical three-phase voltage system to a symmetrical six-phase voltage system. |
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Method and system of wireless control of switching devices in power supply network In the method and system of wireless control of switching devices each power converter comprises semiconductor devices of higher capacity. Control signals are sent between a controller and a wireless unit of one or more of the specified multitude of power converters with application of the wireless communication system. Control signals are sent to a local wireless unit of one or more multiple power converters. Data transmission includes data packages containing such control information that the time module of the local wireless unit may be synchronised with usage of the time synchronising information of the wireless communication system. Other aspects of this invention include a system applying the specified method and software for realisation of this method. |
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Power converter device and method of device control Power converter device is made so that its arm comprises two groups of semiconductor devices connected in series. Each group of semiconductor devices comprises a switching element and semiconductor element, different from the switching element, connected in parallel. The connection point, to which groups of semiconductor devices are connected in series, is an outlet AC lead. Both ends of the arm are DC leads. Besides, the power converter device comprises also a current sensor, a module of voltage control command generation, a module to calculate voltage drop and a module of switch control. |
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Converter of dc voltage into three-phase quasi-sinusoidal one Converter of DC voltage into three-phase quasi-sinusoidal one comprises four serially connected power conversion units: a step-up converter (1) with a control unit (2), a three-phase inverter unit (3) with a control unit (4), a unit of transfilters (5) and a unit of outlet filters (6). |
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Composite capacity and its application Each of capacitor units contains many base capacitors installed on special module printed-circuit board (PCB). All the base capacitors of capacitor units are identical, thus simplifying both manufacturing and maintenance of capacity component. Formation of composite capacity on base capacitors of the same type simplifies significantly their manufacturing and maintenance. Space flexibility achieved due to application of lots of electrically interconnected capacitor units is preferable in such power devices where capacity available to capacity component inside the device may be limited in at least one direction. Geometrically flexible arrangement provided by separate capacitor units allows their arrangement at random angle to each other thus occupying available space in power devices increasing their composite capacity. |
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In accordance with the invention, a subsystem (10) of a branch (T1, …, T6) of valves corresponding to a faulty branch (T1, …, T6) of valves, of a faulty phase module (100) is controlled so that its terminal voltage (UX21) is equal to zero, and therefore accordingly one subsystem (10) corresponding to this branch (T1, …, T6) of valves of the branch (T1, …, T6) of valves of each faulty phase module (100) is controlled so that their terminal voltages (UX21) are equal to zero. Thus a control method is produced to use redundancy in case of a fault of a multi-phase AC rectifier with distributed energy accumulators (9), at the same time the generated output voltages (UL10, UL20 and UL30) no longer contain a DC voltage component. |
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Alternating-current valve inverter with distributed braking resistors Invention pertains to electrical engineering and can be used for drives and in high voltage electrical machine building. In alternating-current valve inverter braking resistance has several separate braking resistors (18) which form part of bipolar submodules (14) respectively; at that in case of in-series connection of submodules (14) they are connected in series and contain at least energy accumulator (16) connected in parallel to a matched braking resistor (18) and controlled high-power semiconductor (28) for braking which in braking position allows passage of current through respective separate braking resistor (18), and in position of normal operation mode it stops passage of current through it. |
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High-voltage frequency-controlled electric drive In the high-voltage frequency-controlled electric drive, an uncontrolled high frequency converter is connected through a multiple-winding single-phase high-frequency transformer to a controlled high frequency converter having a cellular type, wherein inputs of rectifier-inverter cells are connected to corresponding secondary windings of the single-phase high-frequency multiple-winding transformer, the primary winding of which is connected to the output of the uncontrolled high frequency converter, and the input of the latter is connected through a reactor to the mains supply. |
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Pulsed dc voltage controller comprises series-connected first diode, controlled switch, filter inductance and load, two zero-diodes and filter capacitors, a microcontroller, a control driver, a feedback circuit and a manual control panel, a synchronisation unit, two inputs of which are connected to second unlike terminals of first diodes, and two outputs are respectively connected to inputs of the control driver and the microcontroller. The filter inductances are made on a common magnetic conductor and are magnetically coupled. The pulsed controller includes two additional capacitors and two second diodes. Each of the filter inductances is made with an additional lead. The leads of the additional capacitors are connected to additional leads of the filter inductances and the common terminal of the alternating current primary supply, respectively, and leads of the second diodes are connected to the additional and output leads of corresponding filter inductances. |
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Invention may be used to create rectifiers for controlled electric DC and AC drives for machines to increase their efficiency, and also on transformation substations for power supply to electrified railway roads, in electric metallurgical and chemical industry to reduce the value of pulsations of rectified voltage and to reduce content of higher harmonic components in an AC curve in a three-phase grid. The proposed five-phase phase changer comprises a three-phase transformer, having three coils of the primary winding, which are connected as a star network, and are connected to the three-phase grid with a zero wire "0", six joined main coils of the secondary windings, one additional coil of secondary winding and taps from turns of the main coils of the secondary windings, which jointly with the output clamp of the additional coil of the secondary winding create a symmetrical five-phase system of voltages. Each main coil of the secondary winding of the transformer is a side of a "hexagon" A, B, C, D, E, F, transforming a symmetrical three-phase system of voltages into a symmetrical six-phase system of voltages, at the same time the additional coil of the secondary winding with its beginning is connected to the unit of the "hexagon" circuit, which is not connected with the main coils of the secondary winding of the phase, on the rod of which there is the additional coil of the secondary winding. |
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Control method of parallel connected modules of uninterrupted power source Control method involves use of similar modules switched in control chains either to a drive or driven module modes; besides, in the drive module there used is additional feedback as to current of capacitors of output filters of modules. In case of failure of any of the modules, it is disconnected from load and the primary power network, and an operating mode of each module, if required, is changed by means of switches. In order to change over the driven module to the drive module operation, a signal is supplied to its input, which is obtained by switching an input chain from the setting signal of current to sine-shaped voltage signal, from which the connected signal of the main feedback as to voltage and total current signal of capacitors of output filters of modules is deducted. At the same time, a current signal of the drive module is connected to a common control bus of output current of the drive module. When an additional module is being introduced to an uninterrupted power source, first, it is set to a drive module mode, and then it is switched over to a driven module mode. |
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Induction heat treatment of articles In device and method for induction heat treatment an article is pushed through inductor for the purpose of its induction heat treatment. Inductor has electric power of variable frequency. When frequency is changed then electric power is controlled by adjustment of relative pulse duration and amplitude. Alternatively an article can be fixed while inductor moves along it or combined and coordinated movement of articles and inductor. |
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Circuit of power conversion of resonance type comprises a phase-to-phase transformer (406), serially connected to at least one serially connected resonant circuit (403a and 403a' or 403b and 403b') at the outlet of two cascades (402a+b) of the power inverter of DC conversion into AC, supplying to the high-voltage transformer (404) with multiple primary windings. The phase-to-phase transformer (406) serves to eliminate mismatch (ΔI) of resonant output currents (I1, I2) of cascades (402a+b) of the power inverter of DC conversion into AC. The method of control guarantees that the phase-to-phase transformer (406) is not saturated, provides for operation under zero current and provides for minimised losses of power at the inlet. |
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Device comprises the main and the reserve AC circuit of 3-50 Hz, 380 V, the first, second and third switchboard, the first, second and third filter, the first and second rectifier, the first and second current sensor, an inverter, a transformer, a group of stabilised DC voltage consumers, a power supply unit, a unit of power switch drivers, a temperature sensor, a voltage sensor, a microcontroller, a control and indication panel, a unit of fans and an external system of remote control and monitoring, the device includes a limiter of start-up current, and the microcontroller is made as capable of monitoring the voltage value of the first and second AC circuit 3-50 Hz, 380 V, monitoring of the current value at the inverter inlet, monitoring of actuation in the unit of protection and the unit of power switch drivers by high current in open thyristors of the inverter, monitoring of the value of voltage and current of consumption by the group of stabilised DC voltage consumers, and with the possibility for control of the first, second and third switchboard, control of the unit of power switch drivers. |
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Power system comprises a wind power or a hydraulic power turbine 1, connected with a generator 2. The generator 2 has at least two windings 3 of the stator. Each winding 3 of the stator is connected accordingly to one rectifying element 4. Each winding 3 of the stator is connected to the side of AC voltage of the connected rectifying element 4. Each rectifying element 4 is connected accordingly to one circuit 5 of energy accumulation. Each rectifying element 4 at the side of DC voltage is connected in parallel with the connected circuit 5 of energy accumulation. Circuits 5 of energy accumulation are connected to each other in sequence. |
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Frequency converter and voltage stabiliser for uninterrupted power supply In frequency converter and voltage stabiliser for uninterrupted power supply (UPS) an output signal is controlled in converter of one or more UPSs. Distortion stipulated at least partially by ripple voltage can be eliminated from control signal that controls entry of input current to the converter. Systems and methods described in materials of the present application provide a simple and effective method for reduction or elimination of one or more subharmonic oscillations or total harmonic distortion from input current of the converter during synchronous and asynchronous operation modes. The converter can include one or more rectifiers and inverters. |
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Controller for load start-up system Controller for load start-up system, which includes converter for changing output voltage of direct current power supply source, inverter for conversion of direct current voltage supplied from converter to three-phase alternating current voltage that is supplied to load, and smoothing capacitor connected parallel between converter and inverter, includes controller of inverter for pulse-width modulation (PWM) control of inverter with two-phase modulation and controller of converter for PWM control of converter. Frequencies of carrier signal of inverter, which is used in controller of inverter, and carrier signal of converter, which is used in controller of converter, are the same. And when the point of time, to which input electric current to inverter is generated, which corresponds to carrier signal of inverter, is diverted for the specified period of time, phase difference between carrier signal of inverter and carrier signal of converter is offset by the value equal to the specified period. |
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Electric machine and vehicle power system Electric machine comprises a vessel, where stator windings are installed in close proximity to the rotor. There is also a circuit comprising transistors and diodes and connected to the specified windings. A switching circuit is included into a current inverter, which also comprises a pair of inductors installed on power supply buses, and switching capacitors. The current inverter as well as the windings is inside the vessel. A vehicle power system comprises a source of continuous power connected to electric machines by means of integrated electric drives. Each of electric drives comprises at least three windings installed in close proximity to rotors of engines associated with these electric drives. The switching circuit of the accumulating circuit electrically connected to each winding is in closed condition for rotation of the rotors or in opened condition for supply of energy into a local power accumulator. |
Another patent 2513185.